We are also totally bullshitting ourselves when we say "There's nothing we can do", "It's in too much pain", or "It'll be better off this way", especially since humans in the same conditions go to nursing homes, hostpitals, get a private nurse, wheel chairs, a ton of meds, and no one ever says "There's nothing we can do, we have to put down Grandma."

Grandpa: The dog's fourteen, and he can't move around anymore, we gotta get him put down.